fix: improve UI state updates after form submissions

- StrategyStudioPage: auto-select new strategy after creation, clear selection after deletion
- ModelConfigModal: add loading state and async onSave handling
- ExchangeConfigModal: add loading state to prevent duplicate submissions

web/src/components/traders/ExchangeConfigModal.tsx

@@ -84,6 +84,9 @@ export function ExchangeConfigModal({
     null | 'hyperliquid' | 'aster' | 'lighter'
   >(null)
 
+  // 保存中状态
+  const [isSaving, setIsSaving] = useState(false)
+
   // 获取当前编辑的交易所信息
   const selectedExchange = allExchanges?.find(
     (e) => e.id === selectedExchangeId
@@ -218,8 +221,10 @@ export function ExchangeConfigModal({
 
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault()
-    if (!selectedExchangeId) return
+    if (!selectedExchangeId || isSaving) return
 
+    setIsSaving(true)
+    try {
       // 根据交易所类型验证不同字段
       if (selectedExchange?.id === 'binance') {
         if (!apiKey.trim() || !secretKey.trim()) return
@@ -272,6 +277,9 @@ export function ExchangeConfigModal({
         if (!apiKey.trim() || !secretKey.trim()) return
         await onSave(selectedExchangeId, apiKey.trim(), secretKey.trim(), '', testnet)
       }
+    } finally {
+      setIsSaving(false)
+    }
   }
 
   // 可选择的交易所列表（所有支持的交易所）
@@ -1000,6 +1008,7 @@ export function ExchangeConfigModal({
             <button
               type="submit"
               disabled={
+                isSaving ||
                 !selectedExchange ||
                 (selectedExchange.id === 'binance' &&
                   (!apiKey.trim() || !secretKey.trim())) ||
@@ -1029,7 +1038,7 @@ export function ExchangeConfigModal({
               className="flex-1 px-4 py-2 rounded text-sm font-semibold disabled:opacity-50"
               style={{ background: '#F0B90B', color: '#000' }}
             >
-              {t('saveConfig', language)}
+              {isSaving ? t('saving', language) || '保存中...' : t('saveConfig', language)}
             </button>
           </div>
         </form>

web/src/components/traders/ModelConfigModal.tsx

@@ -14,8 +14,8 @@ interface ModelConfigModalProps {
     apiKey: string,
     baseUrl?: string,
     modelName?: string
-  ) => void
+  ) => Promise<void>
-  onDelete: (modelId: string) => void
+  onDelete: (modelId: string) => Promise<void>
   onClose: () => void
   language: Language
 }
@@ -48,16 +48,23 @@ export function ModelConfigModal({
     }
   }, [editingModelId, selectedModel])
 
-  const handleSubmit = (e: React.FormEvent) => {
+  const [isSaving, setIsSaving] = useState(false)
-    e.preventDefault()
-    if (!selectedModelId || !apiKey.trim()) return
 
-    onSave(
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault()
+    if (!selectedModelId || !apiKey.trim() || isSaving) return
+
+    setIsSaving(true)
+    try {
+      await onSave(
         selectedModelId,
         apiKey.trim(),
         baseUrl.trim() || undefined,
         modelName.trim() || undefined
       )
+    } finally {
+      setIsSaving(false)
+    }
   }
 
   // 可选择的模型列表(所有支持的模型)
@@ -277,11 +284,11 @@ export function ModelConfigModal({
             </button>
             <button
               type="submit"
-              disabled={!selectedModel || !apiKey.trim()}
+              disabled={!selectedModel || !apiKey.trim() || isSaving}
               className="flex-1 px-4 py-2 rounded text-sm font-semibold disabled:opacity-50"
               style={{ background: '#F0B90B', color: '#000' }}
             >
-              {t('saveConfig', language)}
+              {isSaving ? t('saving', language) || '保存中...' : t('saveConfig', language)}
             </button>
           </div>
         </form>

web/src/pages/StrategyStudioPage.tsx

@@ -168,7 +168,25 @@ export function StrategyStudioPage() {
         }),
       })
       if (!response.ok) throw new Error('Failed to create strategy')
+      const result = await response.json()
       await fetchStrategies()
+      // Auto-select the newly created strategy
+      if (result.id) {
+        const now = new Date().toISOString()
+        const newStrategy = {
+          id: result.id,
+          name: language === 'zh' ? '新策略' : 'New Strategy',
+          description: '',
+          is_active: false,
+          is_default: false,
+          config: defaultConfig,
+          created_at: now,
+          updated_at: now,
+        }
+        setSelectedStrategy(newStrategy)
+        setEditingConfig(defaultConfig)
+        setHasChanges(false)
+      }
     } catch (err) {
       setError(err instanceof Error ? err.message : 'Unknown error')
     }
@@ -195,6 +213,12 @@ export function StrategyStudioPage() {
       })
       if (!response.ok) throw new Error('Failed to delete strategy')
       notify.success(language === 'zh' ? '策略已删除' : 'Strategy deleted')
+      // Clear selection if deleted strategy was selected
+      if (selectedStrategy?.id === id) {
+        setSelectedStrategy(null)
+        setEditingConfig(null)
+        setHasChanges(false)
+      }
       await fetchStrategies()
     } catch (err) {
       const errorMsg = err instanceof Error ? err.message : 'Unknown error'